Robust Hydrophobic Surfaces Displaying Different Surface Roughness Scales While Maintaining the Same Wettability

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• 作者：Petra M. Hansson ; Lisa Skedung ; Per M. Claesson ; Agne Swerin ; Joachim Schoelkopf ; Patrick A. C. Gane ; Mark W. Rutland ; Esben Thormann
• 刊名：Langmuir
• 出版年：2011
• 出版时间：July 5, 2011
• 年：2011
• 卷：27
• 期：13
• 页码：8153-8159
• 全文大小：920K
• 年卷期：v.27,no.13(July 5, 2011)
• ISSN：1520-5827

文摘

A range of surfaces coated with spherical silica particles, covering the size range from nanometer to micrometer, have been produced using Langmuir鈥揃lodgett (LB) deposition. The particles were characterized both in suspension and in the Langmuir trough to optimize the surface preparation procedure. By limiting the particle aggregation and surface layer failures during the preparation steps, well-defined monolayers with a close-packed structure have been obtained for all particle sizes. Thus, this procedure led to structured surfaces with a characteristic variation in the amplitude and spatial roughness parameters. In order to obtain robust surfaces, a sintering protocol and an AFM-based wear test to determine the stability of the deposited surface layer were employed. Hydrophobization of the LB films followed by water contact angle measurements showed, for all tested particle sizes, the same increase in contact angle compared to the contact angle of a flat hydrophobic surface. This indicates nearly hexagonal packing and gives evidence for nearly complete surface wetting of the surface features.